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subduction |
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subduction [səb′dək·shən] (geology) The process by which one crustal block descends beneath another, such as the descent of the Pacific plate beneath the Andean plate along the Andean Trench. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| In this case, the Caribbean plate subducts, or slides beneath, the North American plate. In one early scenario (figure 1), the lower part of the Indian lithosphere (left), made up of mantle rock, subducts beneath Asia (right) and then sinks down into the mantle. For two decades, geoscientists have debated what happens to the ocean floor when it subducts, or dives down into the Earth's mantle, the region whence it came. |
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